1.1
1.2
1.3
1.4
1.5
100
What is the sum of the atomic masses of all the atoms in a formula for a compound? a) molecular mass b) formula mass c) atomic mass d) actual mass
What is formula mass
100
Which observation does not indicate that a chemical reaction has occurred? a) formation of a precipitate b) production of a gas c) evolution of heat and light d) change in total mass of substances
What is change in total mass of substances
100
A chemical equation is balanced when the..? a) coefficients of the reactants equal the coefficients of the products b) same number of each kind of atom appears in the reactants and in the products c) products and reactants are the same chemicals. d) subscripts of the reactants equal the subscripts of the products.
What is same number of each kind of atom appears in the reactants and in the products
100
In what kind of reaction does a single compound produce two or more simpler substances? a)Decomposition reaction b)Synthesis reaction c)Single-displacement reaction d)Ionic reaction
What is a decomposition reaction
100
The units of molar mass are? a) g/mol b) mol/g c) amu/mol d) amu/g
What is g/mol
200
A formula that shows the simplest whole-number ratio of the atoms in a compound is the? a) molecular formula b) ideal formula c) experimental formula d) empirical formula
What is empirical formula
200
When a solid produced by a chemical reaction separates from the solution it is called? a) a precipitate b) a reactant c) a molecule d) the mass of the product
What is a precipitate
200
After the first steps in writing an equation is balanced by.? a) adjusting subscripts to the formula(s). b) adjusting coefficients to the smallest whole-number ratio. c) changing the products formed d) making the number of reactants equal to the number of products
What is adjusting subscripts to the formula
200
In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds? a)Synthesis reaction b)Double-displacement reaction c)Decomposition reaction d)Combustion reaction
What is a double displacement reaction
200
When the limiting reactant in a chemical reaction is completely used, the? a) excess reactants begin combining. b) reaction slows down c) reaction speeds up d) reaction stops
What is reaction stops
300
The empirical formula for a compound shows the symbols of the elements with subscripts indicating the? a) actual numbers of atoms in a molecule b) number of moles of the compound in 100 g c) smallest whole-number ratio of the atoms d) atomic masses of each element.
What is smallest whole-number ratio of the atoms
300
What is the small whole number that appears in front of a formula in a chemical equation? a) a subscript b) a superscript c) a ratio d) a coefficient
What is a coefficient
300
In what kind of reaction do two or more substances combine to form a new compound? a) decomposition reaction b) ionic reaction c) double- displacement reaction d) synthesis reaction
What is a synthesis reaction
300
When a slightly soluble solid compound is produced in a double-displacement reaction,a a)gas bubbles off. b)precipitate is formed. c)combustion reaction takes place. d)halogen is produced.
What is a precipitate is formed
300
Which reactant controls the amount of product formed in a chemical reaction? a) excess reactant b) mole ratio c) composition reactant d) limiting reactant
What is limiting reactant
400
To find the molecular formula from the empirical formula, one must determine the compound's ? a) density b) formula mass c) structural formula d) crystal lattice
What is formula mass
400
To balance a chemical equation, it may be necessary to adjust the? a) coefficients b) subscripts c) formulas of the products d) number of products
What is coefficients
400
The equation AX---> A + X is the general equation for a ? a) synthesis reaction b) decomposition reaction c) combustion reaction d)single- displacement reaction
What is decomposition reaction
400
An insoluble gas that forms in a double-displacement reaction in aqueous solution a)bubbles out of solution. b)forms a precipitate. c)disassociates into ions. d)reacts with the water.
What is bubbles out of solution
400
A chemical reaction involving substances A and B stops when B is completely used. B is the? a) excess reactant b) limiting reactant c) primary reactant d) primary product
What is limiting reactant
500
In a chemical reaction... a) the mass of the reactants equals the mass of the products b) the mass of the products is greater than the mass of reactants c) the number of atoms in the reactants and products must change. d) energy as heat must be added to the reactants
What is the mass of the reactants equals the mass of the products
500
According to the law of conservation of mass, the total mass of the reacting substances is? a) always more than the total mass of the products b) always less than the total mass of the products c) sometimes more and sometimes less than the total mass of the products. d) always equal to the total mass of the products
What is always equal to the total mass of the products
500
In what kind of reaction does one element replace a similar element in a compound? a)Displacement reaction b)Combustion c)Decomposition reaction d)Ionic reaction
What is a displacement reaction
500
Magnesium hydroxide decomposes to yield magnesium oxide and a)hydrogen. b)oxygen. c)water. d)salt.
What is water
500
What is the ratio of the actual yield to the theoretical yield, multiplied by 100%? a) mole ratio b) percentage yield c) Avogadro yield d) excess yield
What is the percentage yield
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